[RC5] Cracking 40 bits in realtime

Greg Wooledge wooledge at kellnet.com
Fri Jan 2 20:05:07 EST 1998


gindrup at okway.okstate.edu (gindrup at okway.okstate.edu) wrote:

>      Also, don't forget to try pretty much every decompression you can 
>      think of since most *real* encryptors prefer to compress before 
>      encrypting.

Ah!  So, in addition to matching English (or the originator's language)
letter/word frequency tables, do a quick match of the first few bytes
of each decrypted message against the magic numbers found in /etc/magic.

Obviously, that would slow things down a bit.

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